This name is a synonym of Symphyotrichum novi-belgii (L.) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record A4E696C8-25D3-4C2E-8C54-0AE1587C84AA) with original publication details: "Sp. Pl., ed. 2. 2" 1231 1763.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:272881-2.
This name was in version 1 of The Plant List, record gcc-5844.